package com.googlesource.gerrit.plugins.examples.servlet.export;

import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;

import javax.servlet.http.HttpServletResponse;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.net.URLEncoder;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

public class ExcelExportUtil {

    HttpServletResponse response;
    //文件名
    private String fileName;
    //标题名
    private String title;
    //文件保存路径
    private String fileDir;
    //sheet名
    private String sheetName;

    //标题占单元格数
    private int lastCol = 2;
    //表头字体
    private String titleFontType = "微软雅黑";
    //表头背景色
    private String titleBackColor = "000000";
    //表头字号
    private short titleFontSize0 = 14;
    private short titleFontSize1 = 12;
    //添加自动筛选的列 如 A:M
    private String address = "";
    //正文字体
    private String contentFontType = "微软雅黑";
    //正文字号
    private short contentFontSize = 10;
    //Float类型数据小数位
    private String floatDecimal = "0.00";
    //Double类型数据小数位
    private String doubleDecimal = "0.00";
    //设置列的公式
    private String colFormula[] = null;

    DecimalFormat floatDecimalFormat = new DecimalFormat(floatDecimal);
    DecimalFormat doubleDecimalFormat = new DecimalFormat(doubleDecimal);

    private HSSFWorkbook workbook = null;

    public ExcelExportUtil() {}

    public ExcelExportUtil(String fileDir, String sheetName) {
        this.fileDir = fileDir;
        this.sheetName = sheetName;
        workbook = new HSSFWorkbook();
    }

    public ExcelExportUtil(HttpServletResponse response, String fileTitleName, String sheetName, int lastCol) {
        this.fileName = fileTitleName;
        this.title = fileTitleName;
        this.response = response;
        this.sheetName = sheetName;
        this.lastCol = lastCol;
        workbook = new HSSFWorkbook();
    }

    /**
     * 设置表头字体.
     *
     * @param titleFontType
     */
    public void setTitleFontType(String titleFontType) {
        this.titleFontType = titleFontType;
    }

    /**
     * 设置表头背景色.
     *
     * @param titleBackColor 十六进制
     */
    public void setTitleBackColor(String titleBackColor) {
        this.titleBackColor = titleBackColor;
    }

    /**
     * 设置表头字体大小.
     *
     * @param titleFontSize
     */
    public void setTitleFontSize0(short titleFontSize0) {
        this.titleFontSize0 = titleFontSize0;
    }

    public void setTitleFontSize1(short titleFontSize1) {
        this.titleFontSize1 = titleFontSize1;
    }

    /**
     * 设置表头自动筛选栏位,如A:AC.
     *
     * @param address
     */
    public void setAddress(String address) {
        this.address = address;
    }

    /**
     * 设置正文字体.
     *
     * @param contentFontType
     */
    public void setContentFontType(String contentFontType) {
        this.contentFontType = contentFontType;
    }

    /**
     * 设置正文字号.
     *
     * @param contentFontSize
     */
    public void setContentFontSize(short contentFontSize) {
        this.contentFontSize = contentFontSize;
    }

    /**
     * 设置float类型数据小数位 默认.00
     *
     * @param doubleDecimal 如 ".00"
     */
    public void setDoubleDecimal(String doubleDecimal) {
        this.doubleDecimal = doubleDecimal;
    }

    /**
     * 设置doubel类型数据小数位 默认.00
     *
     * @param floatDecimalFormat 如 ".00
     */
    public void setFloatDecimalFormat(DecimalFormat floatDecimalFormat) {
        this.floatDecimalFormat = floatDecimalFormat;
    }

    /**
     * 设置列的公式
     *
     * @param colFormula 存储i-1列的公式 涉及到的行号使用@替换 如A@+B@
     */
    public void setColFormula(String[] colFormula) {
        this.colFormula = colFormula;
    }

    /**
     * 写excel.
     * xls方式
     *
     * @param titleColumn 对应bean的属性名
     * @param titleName   excel要导出的列名
     * @param titleSize   列宽
     * @param dataList    数据
     */
    public void writeExcel(String titleColumn[], String titleName[], int titleSize[], List<?> dataList) {
        //添加Worksheet（不添加sheet时生成的xls文件打开时会报错)
        Sheet sheet = workbook.createSheet(this.sheetName);
        //新建文件
        OutputStream out = null;
        try {
            if (fileDir != null) {
                //有文件路径
                out = new FileOutputStream(fileDir);
            } else {
                //否则，直接写到输出流中
                out = response.getOutputStream();
                fileName = fileName + ".xls";
                response.setContentType("application/msexcel;charset=UTF-8");
                response.setHeader("Content-Disposition", "attachment; filename="
                        + URLEncoder.encode(fileName, "UTF-8"));
            }

            //写入excel的表头0
            Row titleNameRow0 = workbook.getSheet(sheetName).createRow(0);
            titleNameRow0.setHeight((short) 1440);
            CellStyle titleStyle0 = workbook.createCellStyle();
            titleStyle0 = (HSSFCellStyle) setFontAndBorder(titleStyle0, titleFontType, (short) titleFontSize0, true, IndexedColors.WHITE.getIndex());
            titleStyle0 = (HSSFCellStyle) setColor(titleStyle0);
            titleStyle0 = (HSSFCellStyle) setAnother(titleStyle0);
            for (int i = 0; i < titleName.length; i++) {
                sheet.setColumnWidth(i, titleSize[i] * 256);//设置宽度
                Cell cell = titleNameRow0.createCell(i);
                cell.setCellStyle(titleStyle0);
                cell.setCellValue(i == 0 ? title : "");
            }
            CellRangeAddress region = new CellRangeAddress(0, 0, 0, lastCol);
            sheet.addMergedRegion(region);

            //写入excel的表头1
            Row titleNameRow1 = workbook.getSheet(sheetName).createRow(1);
            //设置样式
            CellStyle titleStyle1 = workbook.createCellStyle();
            titleStyle1 = (HSSFCellStyle) setFontAndBorder(titleStyle1, titleFontType, (short) titleFontSize1, true, IndexedColors.WHITE.getIndex());
            //titleStyle1 = (HSSFCellStyle) setColor(titleStyle1, titleBackColor, (short) 12);
            titleStyle1 = (HSSFCellStyle) setColor(titleStyle1);
            titleStyle1 = (HSSFCellStyle) setOther(titleStyle1);

            for (int i = 0; i < titleName.length; i++) {
                sheet.setColumnWidth(i, titleSize[i] * 256);//设置宽度
                Cell cell = titleNameRow1.createCell(i);
                cell.setCellStyle(titleStyle1);
                cell.setCellValue(titleName[i]);
            }

            //为表头添加自动筛选
            if (!"".equals(address)) {
                CellRangeAddress c = (CellRangeAddress) CellRangeAddress.valueOf(address);
                sheet.setAutoFilter(c);
            }

            //通过反射获取数据并写入到excel中
            if (dataList != null && dataList.size() > 0) {
                //设置样式
                CellStyle dataStyle = workbook.createCellStyle();
                dataStyle = (HSSFCellStyle) setFontAndBorder(dataStyle, contentFontType, (short) contentFontSize, false, IndexedColors.AUTOMATIC.getIndex());
                dataStyle = (HSSFCellStyle) setOther(dataStyle);
                if (titleColumn.length > 0) {
                    for (int rowIndex = 1; rowIndex <= dataList.size(); rowIndex++) {
                        Object obj = dataList.get(rowIndex - 1);//获得该对象
                        Class<? extends Object> clsss = obj.getClass();//获得该对对象的class实例
                        Row dataRow = workbook.getSheet(sheetName).createRow(rowIndex + 1);
                        for (int columnIndex = 0; columnIndex < titleColumn.length; columnIndex++) {
                            String title = titleColumn[columnIndex].toString().trim();
                            if (!"".equals(title)) {//字段不为空
                                //使首字母大写
                                String UTitle = Character.toUpperCase(title.charAt(0)) + title.substring(1, title.length());//使其首字母大写;
                                String methodName = "get" + UTitle;

                                // 设置要执行的方法
                                Method method = clsss.getDeclaredMethod(methodName);

                                //获取返回类型
                                String returnType = method.getReturnType().getName();
                                Object object = method.invoke(obj);
                                String data = method.invoke(obj) == null ? "" : object.toString();
                                Cell cell = dataRow.createCell(columnIndex);
                                cell.setCellStyle(dataStyle);
                                if (data != null && !"".equals(data)) {
                                    if ("int".equals(returnType)) {
                                        cell.setCellValue(Integer.parseInt(data));
                                    } else if ("long".equals(returnType)) {
                                        cell.setCellValue(Long.parseLong(data));
                                    } else if ("float".equals(returnType)) {
                                        cell.setCellValue(floatDecimalFormat.format(Float.parseFloat(data)));
                                    } else if ("double".equals(returnType)) {
                                        cell.setCellValue(doubleDecimalFormat.format(Double.parseDouble(data)));
                                    } else if (Date.class.getName().equals(returnType)) {
                                        cell.setCellValue(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(object));
                                    } else {
                                        cell.setCellValue(data);
                                    }
                                }
                            } else {//字段为空 检查该列是否是公式
                                if (colFormula != null) {
                                    String sixBuf = colFormula[columnIndex].replace("@", (rowIndex + 1) + "");
                                    Cell cell = dataRow.createCell(columnIndex);
                                    cell.setCellFormula(sixBuf);
                                }
                            }
                        }
                    }
                }
            }
            workbook.write(out);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    System.out.println("导出写Excel异常");
                }
            }
        }
    }


    /**
     * xlsx方式
     *
     * @param response
     * @param fileName
     * @param titleColumn
     * @param titleName
     * @param titleSize
     * @param dataList
     */
    public void writeBigExcel(HttpServletResponse response, String fileName, String titleColumn[],
                              String titleName[], int titleSize[], List<?> dataList) {
        try {
            SXSSFWorkbook workbook = new SXSSFWorkbook(100);
            OutputStream out = response.getOutputStream();
            String lastFileName = fileName + ".xlsx";
            response.setContentType("application/msexcel;charset=UTF-8");
            response.setHeader("Content-Disposition", "attachment; filename="
                    + URLEncoder.encode(lastFileName, "UTF-8"));
            int k = 0;
            int rowIndex;
            Sheet sheet = workbook.createSheet(fileName + (k + 1));
            //写入excel的表头
            Row titleNameRow = workbook.getSheet(fileName + (k + 1)).createRow(0);
            for (int i = 0; i < titleName.length; i++) {
                sheet.setColumnWidth(i, titleSize[i] * 256);//设置宽度
                Cell cell = titleNameRow.createCell(i);
                cell.setCellValue(titleName[i]);
            }
            //写入到excel中
            if (dataList != null && dataList.size() > 0) {
                if (titleColumn.length > 0) {
                    for (int index = 0; index < dataList.size(); index++) {
                        //每个sheet3W条数据
                        if (index != 0 && (index) % 30000 == 0) {
                            k = k + 1;
                            sheet = workbook.createSheet(fileName + (k + 1));
                            //写入excel的表头
                            titleNameRow = workbook.getSheet(fileName + (k + 1)).createRow(0);
                            for (int i = 0; i < titleName.length; i++) {
                                sheet.setColumnWidth(i, titleSize[i] * 256);//设置宽度
                                Cell cell = titleNameRow.createCell(i);
                                cell.setCellValue(titleName[i]);
                            }
                        }
                        if (index < 30000) {
                            rowIndex = index + 1;
                        } else {
                            rowIndex = index - 30000 * ((index) / 30000) + 1;
                        }
                        Object obj = dataList.get(index);
                        Class<? extends Object> clazz = obj.getClass();
                        Row dataRow = workbook.getSheet(fileName + (k + 1)).createRow(rowIndex);
                        for (int columnIndex = 0; columnIndex < titleColumn.length; columnIndex++) {
                            String title = titleColumn[columnIndex].trim();
                            if (!"".equals(title)) {
                                // 获取返回类型
                                String UTitle = Character.toUpperCase(title.charAt(0)) + title.substring(1, title.length());//使其首字母大写;
                                String methodName = "get" + UTitle;
                                Method method = clazz.getDeclaredMethod(methodName);
                                String returnType = method.getReturnType().getName();
                                Object object = method.invoke(obj);
                                String data = method.invoke(obj) == null ? "" : object.toString();
                                Cell cell = dataRow.createCell(columnIndex);
                                if (data != null && !"".equals(data)) {
                                    if ("int".equals(returnType)) {
                                        cell.setCellValue(Integer.parseInt(data));
                                    } else if ("long".equals(returnType)) {
                                        cell.setCellValue(Long.parseLong(data));
                                    } else if ("float".equals(returnType)) {
                                        cell.setCellValue(new DecimalFormat("0.00").format(Float.parseFloat(data)));
                                    } else if ("double".equals(returnType)) {
                                        cell.setCellValue(new DecimalFormat("0.00").format(Double.parseDouble(data)));
                                    } else if (Date.class.getName().equals(returnType)) {
                                        cell.setCellValue(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(object));
                                    } else {
                                        cell.setCellValue(data);
                                    }
                                } else {//字段为空 检查该列是否是公式
                                    if (colFormula != null) {
                                        String sixBuf = colFormula[columnIndex].replace("@", (rowIndex + 1) + "");
                                        cell = dataRow.createCell(columnIndex);
                                        cell.setCellFormula(sixBuf);
                                    }
                                }
                            }
                        }
                    }
                }
            }
            workbook.write(out);
            out.flush();
            out.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 将16进制的颜色代码写入样式中来设置颜色
     *
     * @param style 保证style统一
     * @param color 颜色：66FFDD
     * @param index 索引 8-64 使用时不可重复
     * @return
     */
//    public CellStyle setColor(CellStyle style, String color, short index) {
//        if ("".equals(color)) {
//            //转为RGB码
//            int r = Integer.parseInt((color.substring(0, 2)), 16);//转为16进制
//            int g = Integer.parseInt((color.substring(2, 4)), 16);
//            int b = Integer.parseInt((color.substring(4, 6)), 16);
//            //自定义cell颜色
//            HSSFPalette palette = workbook.getCustomPalette();
//            palette.setColorAtIndex((short) index, (byte) r, (byte) g, (byte) b);
//            style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
//            style.setFillForegroundColor(index);
//        }
//        return style;
//    }
    public CellStyle setColor(CellStyle style) {
        style.setFillForegroundColor(IndexedColors.GREEN.getIndex());
        style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        return style;
    }

    /**
     * 设置其他样式
     *
     * @param style 保证style统一
     * @return
     */
    public CellStyle setOther(CellStyle style) {
        //style.setAlignment(HorizontalAlignment.CENTER);//水平居中
        style.setVerticalAlignment(VerticalAlignment.CENTER);//垂直居中
        style.setWrapText(true);//自动换行
        return style;
    }

    public CellStyle setAnother(CellStyle style) {
        style.setAlignment(HorizontalAlignment.CENTER);//水平居中
        style.setVerticalAlignment(VerticalAlignment.CENTER);//垂直居中
        style.setWrapText(true);//自动换行
        return style;
    }

    /**
     * 设置字体并加外边框
     *
     * @param style 样式
     * @param style 字体名
     * @param style 大小
     * @return
     */
    public CellStyle setFontAndBorder(CellStyle style, String fontName, short size, boolean bold, short color) {
        HSSFFont font = workbook.createFont();
        font.setFontHeightInPoints(size);
        font.setColor(color);
        font.setFontName(fontName);
        font.setBold(bold);
        style.setFont(font);
        style.setBorderBottom(BorderStyle.THIN);//下边框
        style.setBorderLeft(BorderStyle.THIN);//左边框
        style.setBorderTop(BorderStyle.THIN);//上边框
        style.setBorderRight(BorderStyle.THIN);//右边框
        return style;
    }
}